ASP.NET MVC

Question

How to code for the model,view and controller

Vishal Yelve · Answer

Step 1: Set Up Your Project Create a New ASP.NET MVC Project : Open Visual Studio. Select "Create a new project." Choose "ASP.NET Core Web Application" and click "Next." Name your project and click "Create." Select "Web Application (Model-View-Controller)" and click "Create." Step 2: Understand the Structure In an ASP.NET MVC project, you will typically find the following folders: Models : Contains classes that represent the data and business logic. Views : Contains the UI components (HTML, CSS, etc.) that the user interacts with. Controllers : Contains classes that handle user input, interact with the model, and return views. Step 3: Create a Model Create a model class that represents the data structure. For example, if you are creating a simple application to manage books, you might create a Book model. // Models/Book.cs namespace YourNamespace.Models { public class Book { public int Id { get; set; } public string Title { get; set; } public string Author { get; set; } public int YearPublished { get; set; } } } Step 4: Create a Controller Create a controller that will handle requests related to the Book model. // Controllers/BooksController.cs using Microsoft.AspNetCore.Mvc; using YourNamespace.Models; using System.Collections.Generic; namespace YourNamespace.Controllers { public class BooksController : Controller { private static List books = new List { new Book { Id = 1, Title = "1984", Author = "George Orwell", YearPublished = 1949 }, new Book { Id = 2, Title = "To Kill a Mockingbird", Author = "Harper Lee", YearPublished = 1960 } }; public IActionResult Index() { return View(books); } public IActionResult Details(int id) { var book = books.Find(b => b.Id == id); if (book == null) { return NotFound(); } return View(book); } } } Step 5: Create Views Create views to display the data. For example, create an Index view to list all books and a Details view to show details of a specific book. Index View : Create a new folder named Books under the Views folder. Inside the Books folder, create a new file named Index.cshtml . @model IEnumerable Books Title Author Year Published Details @foreach (var book in Model) { @book.Title @book.Author @book.YearPublished View } Details View : Create a new file named Details.cshtml in the Books folder. @model YourNamespace.Models.Book @Model.Title Author: @Model.Author Year Published: @Model.YearPublished Back to List Step 6: Configure Services In the ConfigureServices method, you need to add MVC services to the dependency injection container. This is typically done using services.AddControllersWithViews() public void ConfigureServices(IServiceCollection services) { services.AddControllersWithViews(); } Step 7: Configure Routing Make sure your application is set up to use MVC routing. This is usually done in the Startup.cs file. public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } else { app.UseExceptionHandler("/Home/Error"); app.UseHsts(); } app.UseHttpsRedirection(); app.UseStaticFiles(); app.UseRouting(); app.UseAuthorization(); app.UseEndpoints(endpoints => { // Default route configuration endpoints.MapControllerRoute( name: "default", pattern: "{controller=Home}/{action=Index}/{id?}"); }); }

Jignesh Kumar · Answer

Hello, public class Employee { public int EmployeeID { get; set; } public string Name { get; set; } public string Department { get; set; } public decimal Salary { get; set; } } Db context : using System.Data.Entity; public class AppDbContext : DbContext { public DbSet Employees { get; set; } } Controller : using System.Linq; using System.Web.Mvc; public class EmployeeController : Controller { private AppDbContext db = new AppDbContext(); // Database context // GET: Employee public ActionResult Index() { var employees = db.Employees.ToList(); // Fetch all employees return View(employees); // Pass data to the view } // GET: Employee/Create public ActionResult Create() { return View(); } // POST: Employee/Create [HttpPost] [ValidateAntiForgeryToken] public ActionResult Create(Employee employee) { if (ModelState.IsValid) { db.Employees.Add(employee); db.SaveChanges(); return RedirectToAction("Index"); } return View(employee); } } Employee : @model IEnumerable Employee List Add New Employee ID Name Department Salary @foreach (var emp in Model) { @emp.EmployeeID @emp.Name @emp.Department @emp.Salary } Add Employee : @model Employee Add Employee @using (Html.BeginForm()) { @Html.AntiForgeryToken() Name: @Html.TextBoxFor(m => m.Name) Department: @Html.TextBoxFor(m => m.Department) Salary: @Html.TextBoxFor(m => m.Salary) Save } Route: public class RouteConfig { public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "Employee", action = "Index", id = UrlParameter.Optional } ); } }

Daniel Wright · Answer

It's great to see your interest in ASP.NET MVC! When coding for the model, view, and controller in ASP.NET MVC, it's important to understand the responsibilities of each component. 1. Model : The model represents the data and business logic of your application. It interacts with the database, processes data, and performs validation. You can define your models using classes in ASP.NET MVC. Here's a simple example of a model class: public class Product { public int ProductId { get; set; } public string Name { get; set; } public decimal Price { get; set; } } 2. View : The view is responsible for presenting the user interface. It displays data to the user and sends user input back to the controller. Views are typically written in HTML with embedded C# or Razor syntax for dynamic content. Here's an example of a view rendering a list of products: @model List @foreach (var product in Model) { @product.Name @product.Price } 3. Controller : The controller handles user input, processes requests, and determines the appropriate response. It interacts with both the model and the view. Controllers are responsible for routing requests to the correct action methods. Here's a simple controller action that retrieves a list of products and passes it to the view: public class ProductController : Controller { public ActionResult Index() { var products = _repository.GetProducts(); // Assuming _repository is your data access layer return View(products); } } In ASP.NET MVC, the flow generally goes like this: a user interacts with the view, which sends data back to the controller, the controller processes the data using the model, and the resulting view is rendered back to the user. Understanding the interactions between the model, view, and controller is crucial for building maintainable and scalable web applications with ASP.NET MVC. I hope this overview helps clarify how to code for the model, view, and controller in ASP.NET MVC! Let me know if you have more specific questions or need further assistance.